title: Is splenectomy a dyslipidemic intervention? Experimental response of serum lipids to different diets and operations.
abstract: Spleen removal may be recommended during organ transplantation in ABO-incompatible recipients as well as for hypoperfusion of the grafted liver, besides conventional surgical indications, but elevation of serum lipids has been observed in certain contexts. Aiming to analyze the influence of two dietary regimens on lipid profile, an experimental study was conducted.
  
  
  METHODS
  Male Wistar rats (n = 86, 333.0 +/- 32.2 g) were divided in four groups: group 1: controls; group 2: sham operation; group 3: total splenectomy; group 4: subtotal splenectomy with upper pole preservation; subgroups A (cholesterol reducing chow) and B (cholesterol-rich mixture) were established, and diet was given during 90 days. Total cholesterol (Tchol), high-density lipoprotein (HDL), low-density lipoprotein (LDL), very-low-density lipoprotein (VLDL), and triglycerides were documented.
  
  
  RESULTS
  After total splenectomy, hyperlipidemia ensued with cholesterol-reducing chow. Tchol, LDL, VLDL, triglycerides, and HDL changed from 56.4 +/- 9.2, 24.6 +/- 4.7, 9.7 +/- 2.2, 48.6 +/- 11.1, and 22.4 +/- 4.3 mg/dL to 66.9 +/- 11.4, 29.9 +/- 5.9, 10.9 +/- 2.3, 54.3 +/- 11.4, and 26.1 +/- 5.1 mg/dL, respectively. Upper pole preservation inhibited abnormalities of Tchol, HDL, VLDL, and triglycerides, and LDL decreased (23.6 +/- 4.9 vs. 22.1 +/- 5.1, P = 0.002). Higher concentrations were triggered by splenectomy and cholesterol-enriched diet (Tchol 59.4 +/- 10.1 vs. 83.9 +/- 14.3 mg/dL, P = 0.000), and upper-pole preservation diminished without abolishing hyperlipidemia (Tchol 55.9 +/- 10.0 vs. 62.3 +/- 7.8, P = 0.002).
  
  
  CONCLUSIONS
  After splenectomy, hyperlipidemia occurred with both diets. Preservation of the upper pole tended to correct dyslipidemia in modality A and to attenuate it in subgroup B.
authors.affiliation: Department of Surgery, Santa Casa de Misericordia de Vitoria, EMESCAM Medical School, Vitoria, Brazil. Icpaulo@unimedvitoria.com.br
authors.forename: Danilo N S
authors.initials: DN
authors.lastname: Paulo
authors.forename: Isabel Cal
authors.initials: IC
authors.lastname: Paulo
authors.forename: Alvaro A C
authors.initials: AA
authors.lastname: Morais
authors.forename: Mitre
authors.initials: M
authors.lastname: Kalil
authors.forename: Alvino J
authors.initials: AJ
authors.lastname: Guerra
authors.forename: Geraldo L
authors.initials: GL
authors.lastname: Colnago
authors.forename: Joel
authors.initials: J
authors.lastname: Faintuch
mesh_terms: D000818:Animals; D002784:Cholesterol / Q000097:blood*; D002791:Cholesterol, Dietary / Q000008:administration & dosage*; D050171:Dyslipidemias / Q000517:prevention & control*; D006949:Hyperlipidemias / Q000453:epidemiology; D008077:Lipoproteins, LDL / Q000097:blood; D008079:Lipoproteins, VLDL / Q000097:blood; D008297:Male; D011183:Postoperative Complications / Q000453:epidemiology; D051381:Rats; D017208:Rats, Wistar; D013156:Splenectomy / Q000009:adverse effects / Q000379:methods; D014280:Triglycerides / Q000097:blood
chemical_list: D002791:Cholesterol, Dietary; D008077:Lipoproteins, LDL; D008079:Lipoproteins, VLDL; D014280:Triglycerides; D002784:Cholesterol